[CI] Align clang-tidy/format versions to LLVM version

Using a different LLVM version to obtain the compile commands may
cause inclusion of compiler flags that aren't recognized by
the older version of clang-tidy.

Author: svenvh

.github/workflows/check-code-style.yml

@@ -61,7 +61,9 @@ jobs:
         curl -L "https://apt.llvm.org/llvm-snapshot.gpg.key" | sudo apt-key add -
         echo "deb https://apt.llvm.org/bionic/ llvm-toolchain-bionic main" | sudo tee -a /etc/apt/sources.list
         sudo apt-get update
-        sudo apt-get install -yqq clang-format-9 clang-tidy-9 llvm-${{ env.LLVM_VERSION }}-dev libomp-${{ env.LLVM_VERSION }}-dev
+        sudo apt-get install -yqq \
+            clang-format-${{ env.LLVM_VERSION }} clang-tidy-${{ env.LLVM_VERSION }} \
+            llvm-${{ env.LLVM_VERSION }}-dev libomp-${{ env.LLVM_VERSION }}-dev
 
     - name: Generate compile command database
       if: ${{ steps.gather-list-of-changes.outputs.HAS_CHANGES }}
@@ -73,7 +75,7 @@ jobs:
       if: ${{ steps.gather-list-of-changes.outputs.HAS_CHANGES }}
       id: run-clang-format
       run: |
-        cat diff-to-inspect.txt | /usr/share/clang/clang-format-9/clang-format-diff.py -p1 > clang-format.patch
+        cat diff-to-inspect.txt | /usr/share/clang/clang-format-${{ env.LLVM_VERSION }}/clang-format-diff.py -p1 > clang-format.patch
         if [ -s clang-format.patch ]; then
           echo "clang-format found incorrectly formatted code:"
           cat clang-format.patch;
@@ -91,8 +93,8 @@ jobs:
       if: ${{ always() && steps.gather-list-of-changes.outputs.HAS_CHANGES }}
       id: run-clang-tidy
       run: |
-        cat diff-to-inspect.txt | /usr/lib/llvm-9/share/clang/clang-tidy-diff.py \
-            -p1 -clang-tidy-binary clang-tidy-9 -quiet \
+        cat diff-to-inspect.txt | /usr/lib/llvm-${{ env.LLVM_VERSION }}/share/clang/clang-tidy-diff.py \
+            -p1 -clang-tidy-binary clang-tidy-${{ env.LLVM_VERSION }} -quiet \
             -path ${{ github.workspace}}/build > clang-tidy.log 2>/dev/null
         # By some reason, clang-tidy log contains tons of extra empty lines,
         # that confuse the check below